1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.internal.widget;
18 
19 import android.text.InputFilter;
20 import android.text.Spanned;
21 import android.widget.TextView;
22 
23 /**
24  * Helper class to disable input on a TextView. The input is disabled by swapping in an InputFilter
25  * that discards all changes. Use with care if you have customized InputFilter on the target
26  * TextView.
27  */
28 public class TextViewInputDisabler {
29     private TextView mTextView;
30     private InputFilter[] mDefaultFilters;
31     private InputFilter[] mNoInputFilters = new InputFilter[] {
32             new InputFilter () {
33                 @Override
34                 public CharSequence filter(CharSequence source, int start, int end, Spanned dest,
35                         int dstart, int dend) {
36                     return "";
37                 }
38             }
39     };
40 
TextViewInputDisabler(TextView textView)41     public TextViewInputDisabler(TextView textView) {
42         mTextView = textView;
43         mDefaultFilters = mTextView.getFilters();
44     }
45 
setInputEnabled(boolean enabled)46     public void setInputEnabled(boolean enabled) {
47         mTextView.setFilters(enabled ? mDefaultFilters : mNoInputFilters);
48     }
49 }
50